Filtrona hardness units gen.

[amateur-1]

Скажите, как переводится Filtrona hardness units? Не нашла в интернете ничего. Шкала единиц твердости ? Спасибо.
Preferably, the longitudinally extending (e.g. substantially cylindrical) core of tobacco smoke filtering material (e.g. cellulose acetate tow) has a hardness of 93% or more Filtrona hardness units, more preferably a hardness of 93-97% Filtrona hardness units. The Filtrona Hardness Unit scale of hardness is well known in the art.

[Décodage]

...93-97% по шкале твердости "Фильтрона"

[amateur-1]

спасибо!